Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Samebug tips

  1. ,

    You are trying to deserialize a type for which Jackson does not provide a default mapper. You should create your custom mapper for this type.

  2. ,

    The easiest solution is to provide a default constructor for the class you want to convert from/to json.

Solutions on the web

via GitHub by OlegZhukov
, 1 year ago
Can not find a (Map) Key deserializer for type [simple type, class com.test.testjackson.testjackson.TestJackson$CompoundKey] at [Source: {"mapProperty":["java.util.HashMap",{"Compound|Key":"Value"}]}; line: 1, column: 37] (through reference chain: com.test.testjackson.testjackson.TestClass["mapProperty"])
via Stack Overflow by Jagger
, 1 year ago
Can not find a (Map) Key deserializer for type [simple type, class com.example.Matchday] at [Source: java.io.ByteArrayInputStream@bbc1e0; line: 1, column: 1]
via GitHub by PawelJagus
, 1 year ago
Can not find a (Map) Key deserializer for type [simple type, class com.example.Matchday] at [Source: java.io.ByteArrayInputStream@bbc1e0; line: 1, column: 1]
via GitHub by benestr
, 1 year ago
Can not find a (Map) Key deserializer for type [simple type, class kotlin.Pair<java.lang.String,java.lang.String>] at [Source: {"map":{"(string1, string2)":"string3"}}; line: 1, column: 1]
via Stack Overflow by James O&#39;Reilly
, 1 year ago
Can not deserialize instance of file.readers.TestAcceptanceCriteria out of START_ARRAY token at [Source: results\acceptanceCriteria.json; line: 1, column: 1]
via Stack Overflow by umesh Kathiriya
, 2 months ago
Can not deserialize instance of AllMarkets out of START_ARRAY token at [Source: [{\"prices\":[{\"id\":1,\"grain\":\"cotton\",\"price\":999},{\"id\":2,\"grain\":\"GroundNut\",\"price\":400}]},{\"prices\":[{\"id\":1,\"grain\":\"cotton\",\"price\":1001},{\"id\":2,\"grain\":\"GroundNut\",\"price\":400}]}]; line: 1, column: 1]
com.fasterxml.jackson.databind.JsonMappingException: Can not find a (Map) Key deserializer for type [simple type, class com.test.testjackson.testjackson.TestJackson$CompoundKey] at [Source: {"mapProperty":["java.util.HashMap",{"Compound|Key":"Value"}]}; line: 1, column: 37] (through reference chain: com.test.testjackson.testjackson.TestClass["mapProperty"]) at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:261) at com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1234) at com.fasterxml.jackson.databind.deser.DeserializerCache._handleUnknownKeyDeserializer(DeserializerCache.java:588) at com.fasterxml.jackson.databind.deser.DeserializerCache.findKeyDeserializer(DeserializerCache.java:168) at com.fasterxml.jackson.databind.DeserializationContext.findKeyDeserializer(DeserializationContext.java:499) at com.fasterxml.jackson.databind.deser.std.MapDeserializer.createContextual(MapDeserializer.java:237) at com.fasterxml.jackson.databind.DeserializationContext.handleSecondaryContextualization(DeserializationContext.java:681) at com.fasterxml.jackson.databind.DeserializationContext.findContextualValueDeserializer(DeserializationContext.java:445) at com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase._findDeserializer(TypeDeserializerBase.java:188) at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer._deserialize(AsArrayTypeDeserializer.java:97) at com.fasterxml.jackson.databind.jsontype.impl.AsArrayTypeDeserializer.deserializeTypedFromObject(AsArrayTypeDeserializer.java:61) at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserializeWithType(MapDeserializer.java:387) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:497) at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:511) at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:396) at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1196) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:314) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3789) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2833) at com.test.testjackson.testjackson.TestJackson.testFails(TestJackson.java:34)